Percussion tool



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,uw ...i .was .I ANHT M N7 Wo. .5W 11S VUA .MD CEE PL F Applicationfiled April 7,

To @ZZ whom t may concern.'

Be it lrnown that l, @Harinas T1717. Wifi/ian, a citizen ot the llnitetStates, residing at Claremont, in the county of Sullivan and State ofNew Hampshire. have invented certain? cw and useful improvements in .Pen

cussion 'lools'` ot which the following is a provide an ininroved tool..l othe ob `ect is to provide a simple, easilyy assembled tool having` aminimum number of Wearing parts 7 and a Ytool in which the torce et' theblovv is delivered. instantaneously to the bit. rllhese and otherobjects and advan" ges ot my iinproved construction wilb however7hereinafter more. fully appear,

ln the acconipanying sliov-fn Ytor purposes oi" il, bodiineiits which myinvent. in practice.

ln these drawing".-

1 is a side elevation partly in section ot injf improved tool.

Fig'. 2 is a longitudinal sectional vieiv thereoiI talien substantiallyon the line 2 2 lfig. 1.

l .i is a ide elevation oi the cam.

Fig. d is a transverse sectional view on the line 4 4 Fig. 2.

Fig. 5 is a partial longitudinal sectional view illustrating a inodiiiedform of my invention.

ln these drawings l have shown a casing or tube 1 provided adjacent oneend thereof with guiding` means herein shown as slots 2 formed in thecasing, these guiding means being adapted to receive a cross head ortransversely disposed section 8 oit a spring? l herein in the term of aspiral coil mounted coairially Within the tube 1. A bit 5 having` anysuitable cutting`v edge 6 is herein shoivn as mounted on. and guided bythe tube or casing 1 by means of a head 7, preferably formed integralwith the bit 5. this head having a reduced portion 8 which may beinserted in the end of the casing. This bit is preferably held inoperative position by a threaded projection 9 which is preferably thecoiled spring 1l,

threaded into one end or the latter retaining the bit in the casing 131.Serial, No. 288,187.

eleasing the spring but herein a sleeve or'head 1() rotatably the rearend oil casing 1 and l no a handle 11 bv means et' which the i tu J Ahead. 10 is rotated to rotate a cain sleeve or shi-ng 12 whichpreferably has cani sur- L ces 13 adapted to e'oOaG-e the ends ot the Nn J w c: L

ad 3 and a longitudinally disposed which permits a tree reciprocation nhead in the cam sleeve 12. This detachably secured thereto by 13 :lelatter facilitating the assembly as to increase the impact ot to thebit, a head 16 havmay be substituted tor the f d the spring l may bethreadle 18 projecting from the ford end ol" Jdie head 1G in amanner'siinioperation oi my improved tool, casing; 1 is gripped in onehand or 'ist relative rotation by any other fred, and the handle 11 isrotated in sleeve 12, the inclined surivill 'torce the cross head 3 or17 races 13 rearwardly until the cross head reaches the slot 111- ivhenthe spring will be :tree to contract and the coils of the springs willcome together simultaneously so as to deliver the additive force ot thesucces-sive coils simultaneousy to the bit 5. rlhe 'force oit the blowdelivered to the bit Will be much gi than it the coils of tbe springscontacted successively so as to produce a blow operative over shorttimed interval instead ot an instantaneous blow.

lt Will be noted that this tool is composed ot but a very teiv partsWhich are easily assembled. that Wear is reduced to a ininimum. that thecost ot manufacture is very snialh and that the part of the instrumentiv" li actuates the bit is also the part or the instrument which retainsthe bit in its proper position in the tube or casing. .lit Will furtherbe noted that iic the bit is not held against the work when the blow iSdelirei to the tool. that the springwill be el l .ted again :is the too!is driven oi|tneuh ont this elongation and the resultant tension olf thespring; will not be sutlicient to materially reduce the 'torce orn theblow.y "iiflhile il liaife in this :inplieation specilically describedtwo embodiments which my invention may assume in practice7 it is to beunderstoofl that thesejforms are shown' for illustrative purposes only,and that the invvention may he modified and embodied in varions otherforms Without departing* from. its spirit or the scope ot the appendedclainis. v

'l/Vhnlt l claim as new and desire to secure by Letters Patent is:

in a tooL :i bit7 resilient actuating ineens for said bit operative totransmit thereto ablou whoee i'orce derived from a plurality ofsimultaneous blows, andl @am ineens for alternately retracting andreleas! ing; "l res'lient means. I

ln a. tool, bit, resilient actuating means for the bit operative totransmit thereto the "torce of a. Qlur'ality of substantiallysimultaneous blows, both to effect retraction and release of: theresilient ineens on unidirectional movement ot said second mentionedmeans.

3. ln a tool, a tool. element, a stationary mis l resilient actua-ti'means thereon minpcisinga spring counting directly with said toolelement7 a cam cooperating With said resilient actuating means, andmeans mounted on the exte 'ior ot said casing for operating said cani,

L ,ln a tool, a easing7 a tool element earried thereby, and means -torstriking a blow and means operative" snjiported by seid casing, a coiledspring attached to said bit Afor retaining the same 1n the easing', across head on. the opposite end ofthe coiled spring, guiding means forysaid cross hea-d and means engaging. said cross sind bit for 'retainingthe same in t easing, a cross head on the opposite end et the coiledspring, anda rotarymember l' o' n cam sui-fece engageable with said headto extend the coiled spring and i 1 be latter at a predeterminedinstant.

bit guided and ln a tooh a. ,rinsing7 e i); said easing, a coiled springatta en to d bit 'for retaining the same 1n the easing, a; cross head onthe opposite end ot the coiled spring'r` means cooperating theieiz'i'ilitor limiting the movement thereof und moans engaging said cross-head toeX- tend the coiled spring and release the latter at a 'piedeterniinedinstant, the coils' of the spring noi' "actingn'ith each othersimultaneously to tinsinit the additive effect of the in peut et thecoils sinniltaneously t the bit when the spring is released.

ln testimony whereof` l a'HiX my signature.

CHARLES WV. NYMANL lioad to extend the: coiled springand release

